78343947 has 24 divisors (see below), whose sum is σ = 125484528. Its totient is φ = 46699200.

The previous prime is 78343943. The next prime is 78343981. The reversal of 78343947 is 74934387.

It is a happy number.

It is not a de Polignac number, because 78343947 - 2² = 78343943 is a prime.

It is a super-2 number, since 2×78343947² = 12275548063077618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78343943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 448 + ... + 12525.

It is an arithmetic number, because the mean of its divisors is an integer number (5228522).

Almost surely, 2^78343947 is an apocalyptic number.

78343947 is a deficient number, since it is larger than the sum of its proper divisors (47140581).

78343947 is a wasteful number, since it uses less digits than its factorization.

78343947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13051 (or 13048 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 78343947 is about 8851.2116119772. The cubic root of 78343947 is about 427.8929678936.

It can be divided in two parts, 7834394 and 7, that added together give a square (7834401 = 2799²).

The spelling of 78343947 in words is "seventy-eight million, three hundred forty-three thousand, nine hundred forty-seven".